Reversible crusher with pivotally adjustable chute and breaker plates



Sept. 20, 1949. A. w. LEMMON ETAL 2,482,279

REVERSIBLE CRUSHER WITH PIVOTALLY ADJUSTABLE CHUTE AND BREAKER PLATES Filed Nov. 5, 1945 2 Sheets-Sheet 1 INVENTORS; I ALEXIS W. LEMMON, Q OEVAL R.STF2A N,

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A. REVERSIBLE CRUSHER WITH PIVOTALLY ADJUSTABLE W. LEMMON ETAL Sept. 20, 1949..

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ATTY.

Patented Sept. 20, 1949 2,482,279 OFFICE REVERSIBLE CRUSHEB WITH PIVOTAL LY ADJUSTABLE CHUTE AND BREAK- EB PLATES Alexis W. Lemmon, Upper Arlington, and Orval R. Strawn, Columbus, Ohio, assignors, by mesne assignments, to The Jeffrey Manufacturing Company, a corporation of Ohio Application November 5, 1945, Serial No. 626,772

3 Claims.

This invention relates to material reducing or conditioning apparatus and more particularly to such apparatus that is preferably, but not necessarily, of the hammer mill type and which is particularly adapted for reducing friable material such, for example, as iron ore, stone, coal and the like.

An object of the invention is to provide an improved reversible material reducing or conditioning apparatus having a reducing chamber and a reducing rotor therein wherein the shape of the reducing chamber may be changed with facility to accommodate the apparatus for reducing various kinds of materials.

In carrying out the foregoing object it is another object of the invention to provide an improved material reducing apparatus having a reducing chamber the sides of which include adjustable breaker plates that may be adjusted individually to different positions, thereby rendering the apparatus highly versatile for reducing materials of various characteristics.

It is another object of the invention to provide an improved reversible material reducing apparatus having a reducing chamber and a reversible rotor therein wherein material entering the reducing chamber is deflected toward the center of the reducing chamber by combination deflector and breaker plates which are positioned to deflect material entering the reducing chamber in accordance with the direction in which the rotor is to be operated.

It is another object of the invention to provide an improved reversible material reducing apparatus having a reducing chamber and a reversible rotor therein wherein material entering the bination deflector walls which are adapted to act selectively as deflector walls of the chute or breaker walls of the reducing chamber.

It is another object of the invention to provide a reversible crusher with adjustable chute means adapted to reduce the tendency for choking of the feed opening when sticky or damp material is being treated.

It is another object of the invention to provide in a material reducing rotor having a material reducing element pivotally attached thereto, a pair of abutments one of which is formed by the rotor body and the other by the swingable elements, each of the abutments presenting a relatively large abutting area adapted to abut one another to limit the pivotal movement of the reducing element.

Other objects of the invention will appear hereinafter the novel features and combinations being set forth in the appended claims.

In the accompanying drawings,

1 Fig. l is an end view in elevation of our improved material reducing apparatus;

Fig. 2 is a side sectional elevational view of the apparatus seen in Fig. 1;

Fig. 3 is a view in section, the section being taken on line 3-3 of F18. 2;

Fig. 4 is a sectional view of one of the breaker plate assemblies seen-in Fig. 3; and

Fig. 5 is a fragmentary sectional view showing a modified form of our invention.

Referring to the drawings, our improved reversible material reducing apparatus has a main frame It) which in general takes the form of a symmetrical easing or housing having a central reducing chamber and top and bottom feed and discharge openings, respectively. The main frame In may be a casting, but we prefer to form it of welded plate construction.

Referring in detail to our preferred construction, the main frame 10 includes a flat rectangular base ll that forms an outlet opening l2 through which material that has been reduced, ground, or pulverized in the apparatus is discharged. Rising upwardly from the ends of the opening I2 in the base H is a pair of end walls l3. Each end wall I3 is welded along its bottom to the base i I and is supported by a pair of spaced gussets or ribs l4 that extend from the tops of the walls to the base and to which they are welded. Extending transversely between the inside faces of the end walls l3 and along the sides of the rectangular outlet opening I2 is a pair of relatively low upstanding plate members l5 that form the sides of the main frame Hi. Preferably the side frame members l5 are welded at their ends to the inside faces of the end walls l3 and along their bottoms to the upper surface of the base H. The gussets M in addition to bracing the end walls l3 support horizontally extending shelves l6 that are spaced outwardly from the walls l3, upwardly from the base ii and the ends of which are welded to the inner faces of the gussets M. The end walls l'3 of the main frame between the gussets l4 and above the shelves i6 form yokes that receive removable wall closure plates l1 and 18, the side flanges l9 of which are bolted together and to the gussets E8. The bottom flanges l9 of the closure plates H are bolted to flanges 20 that extend between the gussets l4 and are Welded to both the end walls l3 of the main frame and the openings and the tubular spacers 34 and are suitably secured to the end discs or plates 32 thereby forming a multi-pieced rotor unit. The end discs 32 and intermediate plates 33 of the rotor body 22 are carried directly upon the shaft 23 and are keyedthereto by a key 36 that is received in a keyway inthe shaft 23 (Fig. 3). Endwise movement of the rotor body 22 is prevented by a pair of internally threaded collars 31 that are threaded on the shaft 23 and abut the end discs 32. The

Y collars 31 may be positively locked to the shaft.

The triangular intermediate plates 33 of the rotor body are pierced at their aplces to receive through pivot pins 40 and the end discs 32 of the rotor body 22 are provided with openings which are aligned with the openings in the intermediate plates and through which the pins 43 are inserted closure plates l1 and I3 form endwallsof a ma terial reducing chamber 41 in the bottom of which the rotor 22 operates. Preferably the inner sides of these walls are protected by replaceable wear resistant plates or liners 4! that arefastened A thereto by a plurality of bolts 43. The liners 45 cooperate to form recesses 43 in which the and discs 32 of the rotor body 22 are receded. Thus flne material moving through the apparatus adjacent the liners will not escape from the reducing chamber past the end discs 32 but will be directed downwardly through the bottom of the reducing chamber 41.

A feed chute it for roperly directing material into the reducing chamber where it will be acted upon by the swing hammers 4| spans the tops of the end walls I 3 and its end walls I4 are in vertical alignment with the inside surfaces of the end walls l3. Thewalls I4 are flanged at Hand these flanges are received by the top flanges of the closure plates It to which they are secured by bolts 5|. The top of. the inlet chute 53 is also flanged outwardly to receive a suitable conduit or hopper, not shown, through which material is supplied to the chute.

and locked in the body. In the embodiment of the invention shown, each pin 43 pivotally carries a pair of material reducing swing hammer elements 4|. The hammers 4| are each comprised of a pair of legs 42 connected by a cross head 43 that pro-.

trudes to one side of one of the legs. The underneath or inside faces of the cross heads are shaped to form abutments 43 presenting relatively large faces or abutting areas that are adapted to engage the bases or sides of the triangular inter-- mediate plates 33 which form the periphery of the rotor body 22. The shape of the plates 33 and the abutments 49 of the cross heads 43 permit-the hammers 4| to swing through an arc of approximately 90 either in a clockwise or a counter-clockwise direction from their normal operating positions seen in Figs. 3 and 5, this because the rotor may be driven either in a clockwise or counter-clockwise direction. The large amount of movement or the swing hammers 4| is particularly advantageous in preventing damage to the reducing apparatus in the event that a large piece of material should enter the reducing apparatus, for example, and not be fracturedby hammer impacts. In such case the hammers 4| may swing and recede inwardly within pockets 33 provided in the rotor body by the shape of intermediate plates until their abutments 43 engage the abutments or outer faces of the intermediate plates 33 to limit their swinging movement and the hammers will pass the piece. The hammers in swinging from their normal radially extended positions into the pockets 39 materially decrease the overall diameter of the rotor 2|. The cross heads 43 of the swing hammers 4| extend sidewardly, as seen at 44, from above one of the legs 42 and a pair of hammers 4| is secured on each pin with their extended portions 44 adjacent one another and overlapping the center intermediate rotor plate 33. Thus in eii'ect the cross heads 43 of each of hammers 4| form a continuous breaker bar but either half of said bar is capable of absorbing abnormal shocks by yielding from its normal :operating position.

Referring particularly to re. a of the draw ings, the-sheet metal walls 62 of the feed chute 30 form in cross section a segment of a cylinder, the top of which is opened to form a material inlet or throat I3. Pivoted within the chute and swingable from side to sidetherein is a gate or combination deflector and breaker plate member or unit it that is adapted to direct material entering the reducing apparatus selectively toward either side of the reducing chamber depending on the direction of rotation of the rotor 2| and to form a movable wall for the top of the reducing chamber 41 for each position of adjustment thereof. The gate or combination deflector and breaker plate member or unit is generally triangular in cross-section and is of heavy welded plate construction including similar heavy side plates 51 that are welded to a shaft 64 and extend radially therefrom at an acute angle to eachother. The outer ends of the plates 51 are welded closely to the arc of the walls of the inlet chute.

-The closure plates l3 and end walls 54 of the chute cooperate to form aligned bearingsthrough which the ends of the shaft 64 extend and in which the gate 55 is pivoted.

Preferably both ends of the shaft 64 protrude outwardly beyond the flanges IQ of the closure plates l1 and I8 and are provided with socket type cross head handles 59 into or over which a bar or lever may be inserted for enabling an operator to swing the gate 55 from side to side in the chute. The gate rests upon the top edges 33 of the replaceable liner plates 45 that are attached to the inside of the closure plates It.

The arcuate side walls 52 of the feed chute 50 are provided at their centers with outstanding reinforcing plates 62 that extend between the top flanges of the chute and the flanges 58 and are welded along their edges to the flanges and arcuate walls: In order to lock the gate or deflector member 55 in either of its operating positions a 1 key 63 is provided that isbolted to either of the outstanding reinforcing plates 62 of the feed chute and projects inwardly through an opening in the arcuate wall 52 thereof and into an opening formed in the curved wall 53 of the gate.

From the description of the device thus far given it will be seen that the upright end members of the main frame are lined and form the ends of the material reducing chamber of the apparatus into which material to be reduced is fed through a chute that includes an adjustable deflector 55 for deflecting the material toward either side of the reducing chamber and for forming a movable top wall of the chamber which also acts as a breaker plate. The unit 55 will be swung counter-clockwise to a position on the other side of chute 50 similar to that shown in Fig. 3, upon reversal of the rotor 22. It will also be seen that the reducing rotor of the apparatus is contained below or in the bottom of the reducin chamber and that the sides of the chamber frame I0 are open above the side frame members I5.

The sides of the apparatus are closed by breaker plate assemblies that are pivotally carried adjacent their tops by the end walls I3 of the main frame I0. Each breaker plate assembly 10 includes a cover, rack, or frame II the end walls I2 of which are adapted to telescope into the main frame I0 of the reducing apparatus between the end walls I3 thereof. The covers or frames II are carried by cross shafts 13 that extend through aligned openings 14 in the ends of the cover II and form trunnions that are received by sockets 15 formed by slots or notches in the tops of the end walls I3 of the main frame I0. The ends of the cross shaft are reduced in diameter to provide shoulders 16 (Fig. 2) that abut the inside faces of the walls I3 for preventing endwise movement of the cross shaft I3 relative to the main frame I0 and slotted locking members TI secured tothe outside of the main frame cover and slots or notches 75 in the end walls and prevent upward movement of the cross shafts 13 in the frame.

Referring to Fig. 4 wherein one of said breaker plate assemblies 70 is seen in section, the cross shaft I3 pivotally carries a primary combination deflector and breaker plate or combination feed chute and breaker plate unit 80. The primary breaker plate 00 may be a casting and it includes a recessed wall BI which extends radially from the pivotal axis of breaker plate 80, which is the axis of cross shaft I3. Said breaker plate 80 also includes an integral arouate wall 82 that extends peripherally from the base or outer end of the wall 8I into the cover or frame ll. Walls 8i and 82 are connected at their ends by integral walls 83 that include a series of arcuately aligned openings 85 in which a pin at is selectively fitted. Pin 84 extends through both of the end Walls 83 into aligned openings in the end walls I2 of the frame, rack, or cover II and is secured in position by cotter keys 86 that abut the walls 83. Arcuate slots 87 (Fig. 1) are provided in the end walls It of the main frame to permit removal of the pins 84 in all positions of adjustment of the covers, frames, or racks 'Il.

Preferably the recessed face of the member 0! has a renewable wear plate 88 inserted therein. It may be pointed out here that the primary breaker plates 80 are mounted to both the main frame I0 and to the covers or frames ll of the breaker plate assemblies I0 through the shafts l3 and pins 84 and that the breaker plates 80 cooperate to form portions of the side walls of the reducing chamber 51 of the apparatus. It may also be pointed out that the shafts 73 support the primary breaker plates 80 so that they cooperate with the feed chute and depend below and to each side of it. The functions and advantages of this structure will be discussed hereinafter.

When rotor 22 travels clockwise, left-hand primary breaker plate 90 will be swung inwardly to form a feed chute, while right-hand breaker plate will be upright, as illustrated in Fig. 3 of the drawings. For reverse rotation of rotor 22, chute 55 will be reversed, left-hand primary breaker plate 80 will be adjusted to vertical position, and right-hand breaker plate 80 will be swung inwardly.

Curved secondary breaker or crusher plates are mounted to the covers or frames 'II of the breaker plate assemblies 10. Each of these curved plates 90. is pivotally carried by a shaft 9| fixed at its ends to the end walls 12 of the assembly frames II below the primary breaker plates 80. The bottom wall 92 of the assembly frame has an upright bifurcated bracket 93 welded thereto carrying a trunnioned head or cross piece 94 that freely receives a bolt 95. Bolt 95 is formed to include a cross head 96 that is secured in a recess in the back or outside of the secondary breaker plate 90 and is secured therein by straps 91 that are bolted to the breaker plate. Each bolt 95 carries a pair of nuts 98 that adjustably lock it to a head or cross piece v9 Referring to Fig. 4 it will be seen that the positions of the secondary breaker plates 90 can be readily shifted with respect to the assembly frames II by adjusting the positions of nuts 98. When the machine is assembled access may be had to the nuts 98 throu h openings 99 formed in the backs of the frames II and access to the cotter keys 86, which must be removed to change the position of the'primary breaker plates 80, may be had through openings I00. Preferably openings 99 and I00 are closed by doors I02 that are bolted to the covers. Depending from the bottom wall 92 of each of the assembly frames II is a pair of spaced legs I05 that are notched in their lower ends at I08 for receiving cross pieces I06 that are similar to cross pieces 94. The tines I01 of the yokes or notches I08 are pierced at I09 (Fig. 4) for receiving removable pins IIO that secure the cross pieces I06 in the legs I05.

Referring now to Fig. 3 it will be seen that each of the cross pieces I06 carries a bolt III that is similar to bolts 95 through which the positions of secondary breaker plates 90 are adjusted by setting nuts I IS. The head N2 of each bolt III is received in an opening H3 in the low frame wall I5 and is secured therein by lugs II I that are bolted to the member I5. Extending across and rigidly connected to the tops of the cross frame members I5 are outwardly, upwardly sloping material directin cross shelf members IIS that form the tops of the openings I I3. In operation a small amount of reduced material may find its way between the primary and secondary breaker plates and between the side walls of the assembly frames and the breaker plates. For this reason the telescoping walls 92 and the side shelves IIB are sloped outwardly and upwardly for directing said material through the outlet opening I2 in the main frame. Resilient sealing strips I23 are provided for sealing the top walls of the covers II to the feed chute 50.

In summary it may be pointed out that the frames 'II of the breaker plate assemblies I0 are pivoted to the main frame I0 and their positions are adjustable through the bolts III and nuts H5 with respect to the main frame I0 and the rotor ill of the reducing apparatus, the primary and secondary breaker plates, of course, moving 7, with the frames II as they are adjusted. The positions of both the primary and secondary plates 30 and 90, respectively, are adjustable indcpendently of each other relative to the frames II. Each breaker plate assembly I maybe removed bodily from the main frame I0 by removing its associatedlocking. members TI and lifting the assembly upwardly and outwardly.

Since most of the top or breaking edges II! of the secondary breaker plates 30 are exposed to a great amount of abuse by the impact of material being reduced we have found it desirable to form the secondary breakers to include renewable sections I I 8 that are bolted thereto. The secondary breaker or grinder plates 30 cooperate with the swing hammers ll of the rotor to crush and grind material and to enhance their operation we have provided in their faces a series of horizontal serrations or grooves 9 which provide the plates with additional crushing surfaces.

Because the pins 40 cannot be withdrawn from the rotor 2| to permit removal of the swing hammers ll without interfering with the rotor shaft bearing blocks 25 we have provided open upstand ing reinforcing lugs I20 on the caps |2I of the bearing blocks 25. With such caps a repairman may remove the swing hammers by removing plates I22 that cover the openings 24 in the sides of the reducing chamber and after releasing the pins 40 from the rotor end discs 32 withdraw them sidewardly through the openings I24 in lugs I20 of the bearing block caps, the lugs I20 providing necessary strength in the bearing block caps I2I.

8 material thus thrown sidewardly in the reducing chamber 41 by the rotor will strike the right hand primary breaker 30 by which it will be further reduced by impact therewith. Some of the material will be deflected from right hand breaker plate 80 upwardly to strike the horizontal plate 51 of deflector S and be further reduced thereby.

The material that has been sufllciently reduced, for the most part, will fall or pass downwardly and be discharged from the apparatus through the outlet openin I2 in the bottom of the main frame. That material which was not sumciently reduced by the impacts of the hammers 4| or by collision with the walls of the reducing chamber will upon striking the walls glance therefrom and be thrown back into the path of the swing hammers. Less friable pieces of material will eventually flnd their way to positions between the rotor 2I and the secondary breaker or grinder plates 30' wherein the blows ofthe swinghammers become more effective for reducing or grind- .ing the material. Should a piece of material that greatly resists reduction flnd its way between the In Fig. 5 we have shown a modified form of our invention. In this embodiment the secondary breaker or crusher plates I30 terminate above rigid breaker bars I30 that extend across and are secured in the main frame III by mounting mechanisms I3I (Figs. 1 and 2) that are formed as a part of the end walls I3. Below the breaker bars I30 is positioned an arcuate screen I32 that encloses the bottom of the rotor and is carried in channels I33 formed by the bottom edges I25 of the lowermost liner plates and arcuate liner plates I2I that are welded to the end walls I3 of the main frame I0.

The embodiment of the invention shown and described in Figs. 1 through 4 may be readily eon-,.

verted to the embodiment shown in Fig. 5 by substituting the secondary breaker plates I03 for the secondary breaker plates 90 and by inserting the breaker bars I30 and the arcuate screen I32 in the mounts I3I and channels I33, respectively. It will be seen that the positions of the secondary breaker plates I90 may be adjusted as desired to expose more or less of the breaker bars I30 which,

of course, will change the reducing characteristics oi the apparatus.

In operation with the parts of the machine positioned as seen in Fig. 3 and with the rotor turning in a clockwise direction, material flowing in the feed chute 50 is guided by the gate or deflector 55 and is deflected toward the left side of the reducing chamber 41 and against the left primary breaker or deflector feed plate 00 which is positioned to deflect or guide the material toward the center of the reducing chamber. The material slides or falls sidewardly from the primary breaker plate 80, which now is cooperating with,

the chute 50 to form a part thereof, into the path of the whirling rotor whereupon it is struck by the swing hammers I The material may be suf- 5 ficiently or partly reduced by impact of the rotor and it will in any event be knocked, impelled or thrown to the right in the reducing chamber. The

secondary breaker plate and the rotor the swing hammers will shift from their normal operating positions to reduce or decrease temporarily the radius of the rotor where the swing hammers engage the resisting piece of material. Thus the material may pass through the reducing apparatus without damaging it. For reverse rotation of rotor 2|, gate 55 will be swung to the opposite side of chute 50, left-hand primary breaker 30 will be adjusted to vertical position, and righthand breaker 30 will swing inwardly. Their operation will be vident from the above description.

In the embodiment shown in Fig. 5 wherein the screen I32 is provided, a piece of material that resists reduction as above described will be carried by the rotor, breaker plates, breaker bars and the of course, cause material being reduced to glance and bounce in substantially predetermined directions in the reducing chamber according to the setting of the breaker plates. For example, by adjusting the position of the assembly frames II outwardly with the primary breaker plate 30 in the position shown in Fig. 4 and then adjusting the heel or bottom portion of the secondary breaker or crusher plate to a position wherein it is closely adjacent the rotor, the side wall so adjusted bulges outwardly at its horizontal center..

Such adjustment of the parts tends to throw more material between the secondary breaker or grinder plate and the swing hammers. It will be seen that since the positions of the primary and secondary breaker plates are independently adjustable, the wall above described may assume many various shape characteristics to affect the reducing functions of the apparatus. Another advantage of our material reducing apparatus resides in the adjustability of the grinder plates and I90 to compensate for the gradual reduction in length of the swing hammers 41 caused by wear.

The curved wall 32 of. the primary breaker plate may function as a deflector for -material that is carried over the screen I32 by the hammers ll. In such case the deflector wall 82 directs the The direction of rotation of the rotor 2| may be reversed in which event it is generally, but not necessarily, desirable to reverse the positions of the right and left hand combination chute and breaker plates 80 and to shift the position of the combination deflector and breaker plate unit 55 in the feed chute by swinging it counter-clockwise to a reverse similar position. Should the direction of the rotor be reversed when the parts of the apparatus are adjusted as seen in Fig. 3, as it is under certain conditions, then material sliding or falling from the primary breaker or combination deflector and breaker plate 80 is knocked by the swing hammers 4| directly against the left hand secondary breaker or grinder plate 90 and crushed. One wall of the combination deflector and breaker unit 55 in the feed chute 50 forms the top reducin or breaker plate of the reducing chamber 4'! when the unit is positioned in either the-right or left hand side of the chute.

Another important feature of our invention is that for either position of adjustment of the chute means 55 and 80 the material being reduced is so delivered to be struck and impelled by the swing hammers 4| that substantially all of said impelled material will travel in a direction away from the effective feed opening to the reducing chamber. This is particularly important when damp or sticky material is being treated because it has been found that there is a great tendency for such material to choke up the feed opening, if any substantial part of it is impelled toward such feed opening or inlet to the feed chamber. This problem has been particularly diificult in connection with iron ore. This characteristic will be evident from a consideration of Fig. 3 because of the deflecting action afforded particularly by the combination breaker and deflector plate 80 which in part extends over the rotor 2| and guides material as it reaches the position where it is struck by a hammer 4| so as to impel it against the working top breaker plate 51 or the breaker plate 88 of the right-hand unit 80. A similar situation prevails for reverse rotation of rotor 2| with the chute means reversely adjusted as above described.

From the foregoing description of our improved material reducing apparatus and its functions it will be readily seen that we have provided a reducing apparatus that is reversible and highly versatile in reducing materials of various characteristics.

Obviously those skilled in the art may make various changes in the details and arrangement of parts without departing from the spirit and scope of the invention as defined by the claims hereto appended and we wish therefore not to be restricted to the precise construction herein disclosed.

Having thus described and shown an embodiment of our invention, what we desire to secure by Letters Patent of the United States is:

1. A reversible reducing apparatus having a reducing chamber, a feed chute including a combination deflector and breaker plate pivotally mounted therein having similar walls extending radially from a pivoted axis at an angle to each other, said combination deflector and breaker plate being adjustable to bring the angular walls selectively into deflecting and breaker plate operating positions, similar combination deflector and breaker plate means forming opposite wall portions of said reducing chamber, and means for swinging either of said second named combination breaker plate means to a position to direct material deflected by said first named combination deflector and breaker plate toward the center of the reducing chamber While the other acts as a breaker plate and vice versa depending upon the direction of operation of the reversible reducing apparatus.

2. A combination breaker and deflector unit for use with material reducing apparatus, said combination breaker and deflector unit including a pair of heavy plates extending radially from an axis at an acute angle to each other, a wall plate integral with and extending peripherally from the outer edges of said first named plates, and wall means for mounting the unit to swing about said axis, the outer surfaces of both said heavy plates acting selectively as guiding deflectors or breaker plate surfaces. l

3. A reversible crusher having a main frame and including a material reducing chamber, a reversible reducing rotor in said chamber, a feed chute above said chamber, a combination deflector and breaker plate pivotally mounted in said feed chute having similar walls extending radially from a pivoted axis at an acute angle to each other, said combination deflector and breaker plate being adjustable to bring the angular walls selectively into material guiding, deflecting and breaker plate operating positions, breaker plate assemblies forming the sides of said reducing chamber, each breaker plate assembly including a frame movably mounted on said main frame and each carrying similar combination breaker plate and chute means and similar crusher plates, means for adjusting the positions of said assembly frames, means for independently adjusting the positions of said crusher plates, and means for individually swinging either of said combination breaker and chute means to a position to direct material toward the rotor while the other is in an upright position and acts as a breaker plate and vice versa, the positions of said combination deflector and breaker plates in the chute and the combination breaker plate and chute means in the reducing chamber depending upon the direction said rotor is to be driven.

ALEXIS W. LEMMON. ORVAL R. STRAWN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 101,984 Curtis Apr. 19, 1870 900,254 Ball Oct. 6, 1908 1,043,513 Dell Nov. 5, 1912 1,281,829 Plaisted Oct. 15, 1918 1,339,950 Fowler May 11, 1920 1,420,354 Williams June 10, 1922 1,422,761 Hartman July 11, 1922 1,443,757 Plaisted Jan. 20, 1923 1,765,309 O'Neill June 17, 1930 1,786,695 Borton Dec. 30, 1930 1,801,604 Jamison Apr. 21, 1931 1,872,233 Borton Aug. 16, 1932 1,947,783 Levin Feb. 20, 1934 2,026,790 Mankofi Jan. 7, 1936 2,141,664 Ossing Dec. 27, 1938 2,149,571 Battey Mar. 7, 1939 2,287,799 Hartshom June 30, 1942 2,360,892 Rench Oct. 24, 1944 2,411,302 Stine Nov. 19, 1946 Wright Apr. 27, 1948 

